1
175, 177, 179
True-rms Multimeters
Calibration Information
Introduction
XW Warning
To avoid electric shock or injury, do not perform the performance tests or calibration
adjustment procedures unless qualified to do so.
The information provided in this document is for the use of qualified personnel only.
The 175, 177, 179 Calibration Information provides the information necessary to adjust and verify
the performance of the 175, 177, and 179 True-rms Multimeters (hereafter known as the Product).
See the 175, 177, 179 Users Manual for complete operating instructions.
Contact Fluke
Fluke Corporation operates worldwide. For local contact information, go to our website:
www.fluke.com
To register your product, view, print, or download the latest manual or manual supplement, go to
our website.
+1-425-446-5500
PN 1600476 (English)
March 2001 Rev. 7, 3/23
©2001-2023 Fluke Corporation. All rights reserved.
Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
175, 177, 179
Calibration Information
2
Safety Information
In this manual, a Warning identifies conditions and procedures that are dangerous to the user. A
Caution identifies conditions and procedures that can cause damage to the Product or the
equipment under test.
General Safety Information is located in the printed Safety Information document that ships with
the Product. It can also be found online at www.fluke.com. More specific safety information is
listed in this manual where applicable.
Specifications
Safety Specifications are located in the Safety Specifications section of the Safety Information
manual. Complete specifications are in the Users Manual at www.fluke.com.
Te s t Le a d A l e r t
To remind you to check that the test leads are in the correct terminals, LEAd momentarily shows on
the display when you move the rotary switch to or from the mA or A position.
XW Warning
Attempting to make a measurement with a test lead in an incorrect terminal might
blow a fuse, damage the Product, and cause serious personal injury.
Test the Fuses
To test the fuses (see Figure 1):
1. Set the Rotary Switch to e.
2. Plug a test lead into the VeG terminal and touch the probe to the 400 mA (to test the 440 mA
Fuse) or 10 A terminal (to test the 11 A Fuse).
If the display shows a resistance value in the range shown in Figure 1 fuse is good.
If the display reads 0L, replace the fuse and test again.
If the display shows any other value, have the Product serviced. See Contact Fluke earlier
in this manual.
True-r ms Multim eters
Replace the Fuses
3
Figure 1. Test the Current Fuses
Replace the Fuses
XW Warning
To prevent possible electrical shock, fire, personal injury, or damage to the Product:
Remove the test leads and any input signals before replacing the fuse.
Use ONLY fuses with the amperage, interrupt, voltage, and speed ratings specified.
To replace the Fuses (see Figure 2):
1. Turn the Rotary Switch to OFF.
2. Disconnect the test leads and/or any connectors from the terminals.
3. Remove the four screws from the Case Bottom and separate the Case Top from the Case
Bottom.
4. Remove the fuses by gently prying one end loose, then slide the fuse out of its bracket, and
replace with a properly rated good fuse.
5. Rejoin the Case Bottom and Case Top, and reinstall the four screws.
11 A 440 mA
Ω
<.5
Ω
<12 OKOK OK
OK
RANGEHOLD MIN MAX
V
175, 177, 179
Calibration Information
4
Replace the Battery
XW Warning
To prevent possible electrical shock, fire, personal injury, or damage to the Product,
replace the battery as soon as the low battery indicator (b) appears.
To replace the Battery (see Figure 2):
1. Turn the Rotary Switch to OFF and remove the test leads from the terminals.
2. Remove the two screws from the Battery Compartment Door, and remove it from the Case
Bottom.
3. Remove the Battery from the battery connector.
4. Replace the Battery with a new 9 V battery (NEDA A1604, 6F22, or 006P).
5. Reattach the Battery Compartment Door to the Case Bottom and reinstall the two screws.
Figure 2. Battery and Fuse Replacement
F2
F1
B1
True-r ms Multim eters
Maintenance
5
Maintenance
XW Warning
To prevent possible electrical shock, fire, personal injury, or damage to the Product:
Repair the Product before use if the battery leaks.
Do not operate the Product with covers removed or the case open. Hazardous voltage
exposure is possible.
Remove the input signals before you clean the Product.
Use only specified replacement parts.
Have an approved technician repair the Product.
Use only specified replacement fuses.
Replace a blown fuse with exact replacement only for continued protection against
arc flash.
Clean the Product
XW Warning
To avoid electrical shock:
Remove test leads and any input signals before cleaning.
Do not reinstall the pca until it is completely dry.
Know that dirt or moisture in the terminals can affect readings.
W Caution
To avoid damaging the Product:
Do not use aromatic hydrocarbons or chlorinated solvents for cleaning. These
solutions will react with the plastics used in the instruments.
Do not use detergents of any kind for cleaning the pca.
Clean the instrument case with a damp cloth and mild detergent.
The pca may be washed with isopropyl alcohol or hot deionized water and a soft brush. Remove
excess cleaning material with clean dry air at low pressure, then dry the pca at 50 °C.
175, 177, 179
Calibration Information
6
Replace the LCD
W Caution
To prevent contamination, do not handle the conductive edges of the LCD or the LCD
Elastomeric Connectors. If the edges are contaminated, clean them with alcohol.
Allow the alcohol to dry before reassembling.
To remove and replace the LCD, perform the following procedure (see Figure 3):
1. Turn the Rotary Switch to OFF and remove the test leads from the Product terminals.
2. Remove the four screws from the Case Bottom, and separate the Case Top from the Case
Bottom.
3. The circuit board remains attached to the Case Bottom.
4. Remove battery compartment door and disconnect the battery from the battery connector.
5. Remove the PCA Screw located under the 440 mA Fuse, and lift the pca out of the Case
Bottom. The beeper is loose in the bottom case. Exercise caution not to damage it.
6. Loosen the 4 screws on the back of the pca. This will facilitate reinstalling the LCD.
7. Insert a small, flat-head screwdriver under the LCD Mask edge and gently pry the LCD Mask
from the snaps.
W Caution
Take care to not break the LCD with the screwdriver.
8. Lift out the LCD.
9. Make sure that all connector contact points are clean. Refer to Clean the Product for more
information.
10. Install a new LCD, taking care that it is correctly oriented.
11. Reattach the LCD Mask to the LCD assembly by snapping the LCD Mask into place.
12. Tighten the 4 screws on the back of the pca.
13. Lay the pca back into the Case Bottom, and screw it down.
14. Reinsert the 440 mA Fuse.
15. Reinstall the Battery.
16. Rejoin the Case Bottom, Case Top, battery compartment door and reinstall the four case
screws.
True-r ms Multim eters
Performance Tests
7
Figure 3. Remove the LCD Mask
Performance Tests
XW Warning
To avoid electric shock, do not perform the performance test procedures unless the
Product is fully assembled.
The following performance tests verify the complete operation of the Product and check the
accuracy of each Product function against its specifications. If the Product fails any part of the
test, calibration adjustment and/or repair is indicated.
In the performance tests, the Product is referred to as the device under test (DUT).
LCD Mask
175, 177, 179
Calibration Information
8
Required Equipment
A Fluke 5500A Multi-Product Calibrator (or equivalent) is required for the performance test
procedures in this document.
If an equivalent calibrator is used, it must meet the accuracy specifications shown in Calibrator
Specifications.
Table 1. Calibrator Specifications
Prepare for the Performance Test
XW Warning
To avoid possible electric shock or personal injury:
Do not perform the following procedures unless qualified to do so. Some procedures
involve the use of high voltages.
Before handling the test connections and in between tests, make sure the calibrator is
in standby mode (STBY).
To prepare for the performance test:
1. Make sure that you have the required equipment (see Calibrator Specifications).
2. Warm up the calibrator as required by its specifications.
3. Allow the temperature of the DUT to stabilize at room temperature (23 °C ± 5 °C [73 °F ± 9 °F]).
4. Check the fuses and Battery, and replace them if necessary. Refer to Test the Fuses,Te s t t h e
Fuses, Replace the Fuses, and Replace the Battery.
Recommended Equipment Measurement Function Accuracy
5500A Multi-Product Calibrator
(or equivalent)
DC Volts 30 mV to 1000 V ±0.0225 %
DC Current 3 mA to 9 A ±0.25 %
AC Volts 300 mV to 1000 V ±0.25 % @ 45 Hz to 1 kHz
AC Current 3 mA to 9 A ±0.375 % @ 45 Hz to 1 kHz
Resistance 25 Ω to 500 Ω ±0.225 %
19 M Ω ±0.4 %
Capacitance 900 nF ±0.30 %
Te m p e r a t u r e -40 to 400 °C 0.25 %
Frequency 5 V, 50 kHz ±0.025 %
Fluke 80 AK K-type Thermocouple Adapter
Accessory Te m p e r a t u re -
K-type Thermocouple, mini-plug on both
ends Te m p e r a t u re -
True-r ms Multim eters
Performance Tests
9
Performance Tests
Note
When calibrating or measuring AC current, avoid the potential for errors from coupled
noise, by either:
1. Shorting the VeG to the COM input.
or
2. Having NO connection to the VeG input.
1. Set the DUT Rotary Switch to the position called for in Tabl e 2 (175) or Ta bl e 3 (177/179), and for
all measurements other than current (amps), connect the calibrator to the VeG and COM input
terminals.
2. If testing the milliamps function, connect the calibrator to the 400 mA and COM input terminals
on the Product.
3. If testing the amps function, connect the calibrator to the 10A and COM input terminals on the
Product.
4. Apply the indicated calibrator output voltages to the DUT for each test (see Tab le 2 or Tab le 3 ).
5. Verify that the DUT displays a reading that is within the limits shown in the Product Response
column.
175, 177, 179
Calibration Information
10
Table 2. Performance Tests 175
Test (Switch Position) 5500 Output Product Response
Lower Limit Upper Limit
K
AC Volts
300 mV 45 Hz 296.7 mV ac 303.3 mV ac
500 mV 500 Hz 494.7 mV ac 505.3 mV ac
500 mV 1 kHz 489.7 mV ac 510.3 mV ac
5 V 45 Hz 4.947 V ac 5.053 V ac
5 V 500 Hz 4.947 V ac 5.053 V ac
5 V 1 kHz 4.897 V ac 5.103 V ac
50 V 45 Hz 49.47 V ac 50.53 V ac
50 V 500 Hz 49.47 V ac 50.53 V ac
50 V 1 kHz 48.97 V ac 51.03 V ac
300 V 45 Hz 296.7 V ac 303.3 V ac
500 V 500 Hz 494.7 V ac 505.3 V ac
500 V 1 kHz 489.7 V ac 510.3 V ac
1000 V 45 Hz 987 V ac 1013 V ac
1000 V 500 Hz 987 V ac 1013 V ac
1000 V 1 kHz 977 V ac 1023 V ac
K Hz
AC Volts Frequency [1]
1 V 45 Hz 44.94 Hz 45.06 Hz
1 V 900 Hz 899 Hz 901 Hz
1 V 9 kHz 8.99 kHz 9.01 kHz
5 V 50 kHz 49.94 kHz 50.06 kHz
L
DC Volts
5 V 4.990 V dc 5.010 V dc
50 V 49.90 V dc 50.1 V dc
300 V 299.3 V dc 300.7 V dc
1000 V 996 V dc 1004 V dc
-1000 V -1004 V dc -996 V dc
L Hz
DC Volts Frequency [1]
3 V 45 Hz 44.94 Hz 45.06 Hz
30 V 50 kHz 49.94 kHz 50.06 kHz
True-r ms Multim eters
Performance Tests
11
Test (Switch Position) 5500 Output Product Response
Lower Limit Upper Limit
E
DC Millivolts
30 mV 29.8 mV dc 30.2 mV dc
-300 mV -300.7 mV dc -299.3 mV dc
600 mV 598.9 mV dc 601.1 mV dc
Ω
Ohms [2]
500 Ω495.3 Ω504.7 kΩ
5 kΩ4.954 kΩ5.046 kΩ
50 kΩ49.54 kΩ50.46 kΩ
500 kΩ495.4 kΩ504.6 kΩ
5 MΩ4.954 MΩ5.046 MΩ
19 MΩ18.68 MΩ19.32 MΩ
E
Capacitance [1]
Apply 0.90 μF887 nF 913 nF
Apply 9 μF8.87 μF9.13 μF
Apply 90 μF88.7 μF91.3 μF
Apply 900 μF887 μF 913 μF
R
Continuity
25 ΩBeeper On
250 ΩBeeper Off
G
Diode [1] Apply 2.0 V 1.978 V dc 2.022 V dc
F
AC Milliamps
3 mA 45 Hz 2.92 mA ac 3.08 mA ac
50 mA 1 kHz 49.22 mA ac 50.78 mA ac
400 mA 1 kHz 393.7 mA ac 406.3 mA ac
?
AC Amps
4.0 A 45 Hz 3.937 A ac 4.063 A ac
9.0 A 1 kHz 8.83 A ac 9.17 A ac
mA
DC Milliamp [1]
3 mA 2.94 mA dc 3.06 mA dc
50 mA 49.47 mA dc 50.53 mA dc
-400 mA -404.3 mA dc -395.7 mA dc
A
DC Amps [1]
4.0 A 3.957 A dc 4.043 A dc
-9.0 A -9.12 A dc -8.88 A dc
[1] Press B to access this function.
[2] Does not include test lead resistance.
Table 2. Performance Tests 175 (cont.)
175, 177, 179
Calibration Information
12
Table 3. Performance Tests 177/179
Test (Switch Position) 5500 Output
Product Response
Lower Limit Upper Limit
K
AC Volts
300 mV 45 Hz 296.7 mV ac 303.3 mV ac
500 mV 500
Hz
494.7 mV ac 505.3 mV ac
500 mV 1 kHz 489.7 mV ac 510.3 mV ac
5 V 45 Hz 4.947 V ac 5.103 V ac
5 V 500 Hz 4.947 V ac 5.053 V ac
5 V 1 kHz 4.897 V ac 5.103 V ac
50 V 45 Hz 49.47 V ac 50.53 V ac
50 V 500 Hz 49.47 V ac 50.53 V ac
50 V 1 kHz 48.97 V ac 51.03 V ac
300 V 45 Hz 296.7 V ac 303.3 V ac
500 V 500 Hz 494.7 V ac 505.3 V ac
500 V 1 kHz 489.7 V ac 510.3 V ac
1000 V 45 Hz 987 V ac 1013 V ac
1000 V 500 Hz 987 V ac 1013 V ac
1000 V 1 kHz 977 V ac 1023 V ac
K Hz
AC Volts Frequency [1]
1 V 45 Hz 44.94 Hz 45.06 Hz
1 V 900 Hz 899 Hz 901 Hz
1 V 9 kHz 8.99 kHz 9.01 kHz
5 V 50 kHz 49.94 kHz 50.06 kHz
L
DC Volts
5 V 4.993 V dc 5.007 V dc
50 V 49.93 V dc 50.07 V dc
300 V 299.5 V dc 300.5 V dc
1000 V 997 V dc 1003 V dc
-1000 V -1003 V dc -997 V dc
L YVe@
DC Volts Frequency [1]
3 V 45 kHz 45.06 Hz 44.94 Hz
E
DC Millivolts
30 mV 0 Hz 29.8 mV dc 30.2 mV dc
-300 mV -300.5 mV dc -299.5 mV dc
600 mV 599.3 mV dc 600.7 mV dc
True-r ms Multim eters
Performance Tests
13
Test (Switch Position) 5500 Output
Product Response
Lower Limit Upper Limit
e
Ohms [2]
500 Ω495.3 Ω504.7 Ω
5 kΩ4.954 kΩ5.046 kΩ
50 kΩ49.54 kΩ50.46 kΩ
500 kΩ495.4 kΩ504.6 kΩ
5 MΩ4.954 MΩ5.046 MΩ
19 MΩ18.68 MΩ19.32 MΩ
E
Capacitance [1]
Apply 0.90 μF887 nF 913 nF
Apply 9 μF8.87 μF9.13 μF
Apply 90 μF 88.7 μF91.3 μF
Apply 900 μF 887 μF913 μF
R
Continuity
25 ΩBeeper On
250 ΩBeeper Off
G
Diode [1] 2.0 V 1.978 V dc 2.022 V dc
F
AC Milliamps
3 mA 45 Hz 2.92 mA ac 3.08 mA ac
50 mA 1 kHz 49.22 mA ac 50.78 mA ac
400 mA 1 kHz 393.7 mA ac 406.3 mA ac
?
AC Amps
4.0 A 45 Hz 3.937 A ac 4.063 A ac
9.0 A 1 kHz 8.83 A ac 9.17 A ac
mA
DC Milliamp [1]
3 mA 2.94 mA dc 3.06 mA dc
50 mA 49.47 mA dc 50.53 mA dc
-400 mA -404.3 mA dc -395.7 mA dc
A
DC Amps [1]
4.0 A 3.957 A dc 4.043 A dc
-9.0 A -9.12 A dc -8.88 A dc
T
Temperature [1] [3] [4]
(179 only)
0 °C -1.0 °C1.0 °C
-40 °C-41.4 °C-38.6 °C
400 °C 395.0 °C405.0 °C
[1] Press B to access this function.
[2] Does not include test lead resistance.
[3] Be sure to use correct cable.
[4] To ensure accuracy, the Product and thermocouple adapter must be at the same temperature. Allow 20 minutes before performing
the temperature procedures.
Table 3. Performance Tests 177/179 (cont.)
175, 177, 179
Calibration Information
14
Calibration Adjustment
Perform the calibration adjustment procedures if the Product fails the performance test.
The Product buttons behave as follows when the calibration mode is enabled:
Calibration Adjustment Procedure
Use the following steps to adjust the Product’s calibration:
For Products with a serial number of 84060000 and below, switch the Product to volts AC (C). For
Products with a serial number of 83911001 to 83911240 and 84060001 and above, switch the
Product to E DC.
1. Turn the Product over and find the Calibration Seal located near the top of the Product (see
Tab l e 4 ).
2. With a small probe, break the Calibration Seal and press the Calibration Button for 1 second. The
Product will beep and change to the calibration mode. The display reads C-01, designating the
first calibration step. The Product remains in calibration mode until the Rotary Function Switch is
turned to OFF.
3. Proceed through the calibration steps by entering the input value listed in the table for each
step.
HPress and hold to test the present function. This measurement is uncalibrated
and may be inaccurate. This is normal.
MPress and hold to display the required input.
RPress to skip the present calibration step without accepting the input signal.
Note
If a calibration step is skipped, the remaining calibration procedure may
be invalidated.
Note
This feature is not available for units with serial numbers 83911001 to
83911240 and 84060001 and above.
B(YELLOW button) Press to store the calibration value and advance to the next
step. This button is also used to exit calibration mode after the calibration
adjustment sequence is complete.
True-r ms Multim eters
Calibration Adjustment
15
Note
When calibrating or measuring AC current, avoid the potential for errors from coupled
noise, by either:
Shorting the VeG to the COM input
or
Having NO connection to the VeG input
Note
Press B and wait until the step number advances before changing the calibrator source or
turning the Rotary Function Knob.
4. After each input value is applied, press B to accept the value and proceed to the next step
(C-02 and so forth).
5. When the last step in a function is reached, turn the Rotary Function Knob to the next required
function. The Product will not allow a step to be completed if the Rotary Function Knob is
turned to the wrong function.
Note
If the calibration adjustment procedure is not completed correctly, the Product will not
operate correctly. When calibration adjustment is not performed correctly, the Product
displays the messages CAL and Err and the Product must be recalibrated.
The Product is damaged and requires service if:
CAL and Err messages continue to appear after a proper recalibration.
EEPr and Err messages are alternating on the display.
EEPr message appears on the display.
175, 177, 179
Calibration Information
16
Table 4. Calibration Steps
If the Product has a serial number of 84060000 or below, or 83911241 to 84060000, use the
following steps.
Function (Switch Position) Calibration Step Input Value
C
(AC Volts)
C-01 6.000 V, 900.0 Hz
C-02 600.0 mV, 100 Hz
C-03 6.000 V, 100 Hz
L
(DC Volts)
C-04 6.000 V dc
C-05 60.00 V dc
C-06 600.0 V dc
C-07 1000 V dc
T E
DC Millivolts
(Temperature - 179 only) [1]
C-08 600.0 mV dc
C-09 0.0 °C
e
(Ohms)
C-09 (175/177)
C-10 (179)
6.000 kΩ
R
(Continuity)
C-10 (175/177)
C-11 (179)
600 Ω
mA
(Milliamps)
C-11 (175/177)
C-12 (179)
600.0 mA dc
A
(Amps)
C-12 (175/177)
C-13 (179)
6.000 A dc
Calibration Seal
C
alibration Button
True-r ms Multim eters
Calibration Adjustment
17
If the Product has a serial number from 83911001 to 83911240 or 84060001 and above, or if
the model number flashes on the display at turn on, use the following steps.[2]
Function (Switch Position) Calibration Step Input Value
E
(DC Millivolts)
C-01 600.0 mV dc
C-02 120.0 mV dc
L
(DC Volts)
C-03 6.000 V dc
C-04 60.00 V dc
C-05 600.0 V dc
C
(AC Volts)
C-06 600.0 mV, 60 Hz
C-07 600.0 V, 60 Hz
e
(Ohms)
C-08 600.0 Ω
C-09 6.000 kΩ
C-10 60.00 kΩ
C-11 600.0 kΩ
C-12 6.000 MΩ
O
(Diode Test) C-13 5.000 V dc
mA
(Milliamps)
C-14 400.0 mA dc
C-15 400.0 mA ac, 60 Hz
A
(Amps)
C-16 6.000 A dc
C-17 6.000 A ac, 60 Hz
[1] To ensure accuracy, the Product and Thermocouple Adapter must be at the same temperature. Allow 20 minutes before
performing the temperature procedures.
[2] If the Product is not connected correctly, or if the rotary switch is in the wrong position, the Product will beep 2 times to alert the
user.
Table 4. Calibration Steps (cont.)
175, 177, 179
Calibration Information
18
User-Replaceable Parts and Accessories
User-replaceable parts and accessories are shown in Table 5 and Figure 5.
Table 5. User-Replaceable Parts and Accessories
Item Description Part No Qty
-- TL75 Test Lead Set (Not shown) [1] 855705 1
ACase Top (Model 175)
Case Top (Model 177)
Case Top (Model 179)
1591675
1589129
1589118
1
1
1
BShock Absorber 428441 1
CKeypad (177, 179)
Keypad (175)
1560052
1560842
1
1
DLCD Mask (175)
LCD Mask (177)
LCD Mask (179)
1587908
1587896
1587881
1
1
1
ELCD 1560856 1
FLCD Light Pipe (177 & 179) 1564806 1
GW Fuse, 11 A, (fast acting), 1000 V ac/dc, minimum
interrupt rating 17 kA [2] 803293 1
HW Fuse, 440 mA (fast acting), 1000 V ac/dc, minimum
interrupt rating 10 kA [2] 943121 1
IPCA Screw 519116 1
JShield, AC 648755 1
KAC Shield screw and Internal Cover screws 448456 5
LCase Bottom serial numbers 83911001 to 83911240 and
84060001 and above (includes Bottom Shield and
Calibration Button, Beeper not included)
2095692 1
MBattery, 9 V (Alkaline, 9 V, 0-200 mA) 614487 1
NBattery Compartment Door 1564799 1
OCase Screws 832246 4
PTilt Stand 648961 1
QLCD Elastomeric Connector 650264 2
RInternal Cover 1564786 1
SBattery Connector, serial number 8391100 and below,
and 83911241 to 84060000 825976 1
True-r ms Multim eters
Calibration Adjustment
19
Figure 4. Table 6. User-Replaceable Parts and Accessories (cont.)
Item Description Part No Qty
TBattery Connector, serial numbers 8391101 to 83911240
and 84060001 and above 1988201 1
UBeeper, serial numbers 8391101 to 83911240 and
84060001 and above 2041050 1
VSwitch Detent Spring 822643 1
WSwitch Knob 648706 1
XCalibration Button 1564889 1
YLens 648714 1
[1] Fluke accessories are available from your authorized Fluke distributor.
[2] WTo avoid shock, injury, or damage to the Product, use exact replacement only.
175, 177, 179
Calibration Information
20
Figure 5. User-Replaceable Parts and Accessories
2
24
23
19
7
1
18
10
16
15
14
22
4X
2X
5X
12
3
25
4
5
6
8
9
11
13
17
20
21
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